Another method is to have a single schematic symbol with a matching
footprint. In the schematic symbol, you have extra pins which correspond to
the additional pads, and which are super-imposed on each other. E.g., pins
1 and 1A will be on top of each other; then hide the name/number of 1A (do
NOT make it a hidden pin!). I typically use a circle-symbol pin and a
straight pin over each other to make it very obvious it's a double pin.
Dwight Harm
Agreed, and I sometimes use this method as well. However, the method I
described in my previous post has the advantage that you can use a
through-hole footprint in conjunction with a SM footprint, and without
having to create a "hybrid" footprint (in a PCB Library file) nor a "hybrid"
component (in a Schematic Library file). And these footprints can still be
used on their own, in PCBs where you don't want (or don't have the room to
fit) dual footprints.
I have mentioned it in previous posts, but I will repeat it here. When
creating and using footprints and (corresponding/matching Schematic)
components, it is prudent for *every* pad/pin (per component) to have an
*unique* number/designator. Although Protel is supposed to have lifted its
act on this matter, complying with that convention still avoids problems
that can otherwise occur.
So a "hybrid" relay should have pins 1, 1A, 2, 2A, ... (both schematic
component and footprint). (In the case of my previous post, where I
described the use of two footprints and two schematic components, this was
not an issue, because there is a REL1-1 pad/pin and a Rel1A-1 pad/pin, etc,
thus preserving the uniqueness of every pad's/pin's identity.)
Regards,
Geoff Harland.
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